<?php
define('DB_HOST','localhost');
define('DB_USER','lao');
define('DB_PASS','123456');
define('DB_NAME','review_app');

$conn=new mysqli(DB_HOST,DB_USER,DB_PASS,DB_NAME);

if($conn->connect_error){

    die("链接失败".$conn->connect_error);
}
echo "连接成功";
?>